25011

Check Current Timeout Setting

Navigate to Parameters → Machine Data → Spindle → MD35110 and note the current SPIND_POSITIONING_TIME value in milliseconds.

Typical values range from 3000-10000ms depending on spindle inertia and drive response

Monitor Actual Orientation Time

Use Service → Trace → Spindle signals to measure actual time from M19 command to orientation complete signal during manual test.

Add 50% safety margin to measured time for the new MD35110 value

Increase Timeout Value

Set MD35110 to 150% of measured orientation time, save parameters, and perform RESET to activate changes.

Excessive timeout values can cause long program delays if mechanical problems develop

Test Orientation Cycle

Execute M19 command in MDI mode and verify spindle reaches position without alarm 25011.

Test at different spindle speeds to ensure timeout works for all operating conditions

Check Positioning Window

Access Parameters → Machine Data → Spindle → MD35100 to view current SPIND_POSITIONING_WINDOW value in degrees.

Standard values are typically 0.1-1.0 degrees depending on application requirements

Analyze Position Deviation

Use Diagnostics → Spindle → Position Display to observe actual vs. commanded position during orientation attempts.

Look for consistent offset or oscillation around target position

Temporarily Increase Window

Double the MD35100 value as a test, save parameters, and execute RESET to activate the change.

Verify increased window still meets tool change accuracy requirements

Verify Successful Orientation

Test M19 orientation multiple times to confirm consistent success with wider positioning window.

If successful, gradually reduce window to find optimal balance between accuracy and reliability

Check Encoder Signal Quality

Navigate to Diagnostics → Drive → Encoder Signals and monitor spindle encoder A/B channels and zero pulse during slow rotation.

Look for irregular pulse patterns, missing zero pulses, or amplitude variations

Verify Encoder Connections

Inspect encoder cable connections at spindle motor and drive module, checking for loose connections, corrosion, or damaged pins.

Power down system before checking electrical connections

Test Encoder Functionality

Use Service → Encoder Test function to verify proper pulse count and direction sensing during manual spindle rotation.

Compare pulse count with expected value based on encoder resolution and rotation angle

Check Reference Point

Execute spindle reference point search and verify DB31.DBX1.4 (spindle referenced) bit sets properly in PLC diagnostics.

Failed reference point establishment often indicates encoder zero pulse problems

Check Spindle Brake Release

Monitor PLC signal DB31.DBX0.6 (spindle brake release) in Diagnostics → PLC → I/O Status during orientation command.

Brake should release immediately when M19 is commanded

Test Manual Spindle Movement

With spindle brake released and drive disabled, manually rotate spindle to check for mechanical binding or excessive resistance.

Ensure all safety procedures are followed when manually rotating spindle

Monitor Drive Current

Use Diagnostics → Drive → Current Display to observe spindle drive current during orientation attempts for signs of excessive load.

Current spikes or sustained high current indicate mechanical resistance

Verify Brake Air Pressure

Check pneumatic pressure at spindle brake cylinder meets specification (typically 6 bar minimum) and solenoid valve operates correctly.

Low air pressure causes incomplete brake release and sluggish orientation response

Check Drive Interface Signals

Monitor DB31.DBX1.5 (orientation active) and DB31.DBX1.6 (orientation complete) in Diagnostics → PLC → Spindle I/O during M19 execution.

Orientation active should set immediately, complete should follow within timeout period

Verify Drive Communication

Check PROFIBUS/PROFINET communication status in Diagnostics → Hardware → Network and verify spindle drive shows 'RUN' status.

Communication errors may affect multiple drive functions beyond orientation

Test Drive Response

Use drive's internal diagnostics to verify it receives orientation commands and can execute positioning moves independently.

Drive should show position setpoint changes when orientation is commanded

Check Interface Wiring

Verify hardwired interface signals between controller and drive if not using bus communication, focusing on orientation enable and complete signals.

Use oscilloscope to verify signal timing and voltage levels meet specifications